Who can write a telephone order?

I want to ask the experts.

Is there a law or regulation regarding who may take a telephone order?

A new clerk took a phone order to discharge a patient.
She said it was standard policy at her previous job.
This is an acute care hospital.

I found CMS requirements for orders to be signed within a time frame but nothing about an unlicensed person taking orders over the phone.

At our hospital only an RN may take all orders. Respiratory, LVNs, Dieticians, and other licensed professionals may take orders within their scopes. This is hospital policy.
The RN called the physician back and the clerk knows not to take an order again, but it got me wondering.